In 2022, when the sky above Tokyo was filled with drones on a daily basis, Yamazaki Yui (Mori), a chief appraiser at a real estate company, and his subordinate Kobayashi visited a condominium they had purchased for an inspection. As they were about to return to the office after completing their business, they were enveloped in a bright light. They were forced to take shelter in the basement level 3 shelter until decontamination was completed due to a suspected drone crash carrying a biological weapon. Time and space for just the two of them. And then...
